GEOLOGY

Detailed explanation-1: -Block mountains are formed due to the upward movement of the middle block between two normal faults.

Detailed explanation-2: -Fault-block mountains are formed by the movement of large crustal blocks along faults formed when tensional forces pull apart the crust (Figure 3). Tension is often the result of uplifting part of the crust; it can also be produced by opposite-flowing convection cells in the mantle (see Figure 1).

Detailed explanation-3: -Fault-block mountains generally form by extension of the continental crust. The best examples include the Basin and Range Province of the western United States, and parts of the East African Rift System, including the Ethiopian Afar.

Detailed explanation-4: -A crack called a fault forms when large blocks of rock break and move past each other. The blocks of rock on either side of a fault are called fault blocks. The movement of faults can create mountains and other landforms.

Detailed explanation-5: -Block Mountains are formed when two tectonic plates move away from each other causing cracks on the surface of the Earth. This forces a slab of land to break off and is forced upwards. Thus, block mountains are formed by vertical displacement of land.